Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/markupsafe/__init__.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 # -*- coding: utf-8 -*-
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2 """
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3 markupsafe
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4 ~~~~~~~~~~
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5
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6 Implements a Markup string.
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7
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8 :copyright: (c) 2010 by Armin Ronacher.
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9 :license: BSD, see LICENSE for more details.
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10 """
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11 import re
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12 import string
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13 from collections import Mapping
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14 from markupsafe._compat import text_type, string_types, int_types, \
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15 unichr, iteritems, PY2
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16
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17
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18 __all__ = ['Markup', 'soft_unicode', 'escape', 'escape_silent']
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19
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20
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21 _striptags_re = re.compile(r'(<!--.*?-->|<[^>]*>)')
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22 _entity_re = re.compile(r'&([^;]+);')
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23
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24
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25 class Markup(text_type):
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26 r"""Marks a string as being safe for inclusion in HTML/XML output without
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27 needing to be escaped. This implements the `__html__` interface a couple
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28 of frameworks and web applications use. :class:`Markup` is a direct
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29 subclass of `unicode` and provides all the methods of `unicode` just that
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30 it escapes arguments passed and always returns `Markup`.
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31
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32 The `escape` function returns markup objects so that double escaping can't
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33 happen.
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34
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35 The constructor of the :class:`Markup` class can be used for three
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36 different things: When passed an unicode object it's assumed to be safe,
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37 when passed an object with an HTML representation (has an `__html__`
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38 method) that representation is used, otherwise the object passed is
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39 converted into a unicode string and then assumed to be safe:
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40
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41 >>> Markup("Hello <em>World</em>!")
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42 Markup(u'Hello <em>World</em>!')
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43 >>> class Foo(object):
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44 ... def __html__(self):
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45 ... return '<a href="#">foo</a>'
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46 ...
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47 >>> Markup(Foo())
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48 Markup(u'<a href="#">foo</a>')
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49
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50 If you want object passed being always treated as unsafe you can use the
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51 :meth:`escape` classmethod to create a :class:`Markup` object:
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52
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53 >>> Markup.escape("Hello <em>World</em>!")
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54 Markup(u'Hello &lt;em&gt;World&lt;/em&gt;!')
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55
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56 Operations on a markup string are markup aware which means that all
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57 arguments are passed through the :func:`escape` function:
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58
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59 >>> em = Markup("<em>%s</em>")
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60 >>> em % "foo & bar"
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61 Markup(u'<em>foo &amp; bar</em>')
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62 >>> strong = Markup("<strong>%(text)s</strong>")
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63 >>> strong % {'text': '<blink>hacker here</blink>'}
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64 Markup(u'<strong>&lt;blink&gt;hacker here&lt;/blink&gt;</strong>')
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65 >>> Markup("<em>Hello</em> ") + "<foo>"
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66 Markup(u'<em>Hello</em> &lt;foo&gt;')
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67 """
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68 __slots__ = ()
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69
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70 def __new__(cls, base=u'', encoding=None, errors='strict'):
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71 if hasattr(base, '__html__'):
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72 base = base.__html__()
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73 if encoding is None:
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74 return text_type.__new__(cls, base)
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75 return text_type.__new__(cls, base, encoding, errors)
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76
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77 def __html__(self):
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78 return self
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79
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80 def __add__(self, other):
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81 if isinstance(other, string_types) or hasattr(other, '__html__'):
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82 return self.__class__(super(Markup, self).__add__(self.escape(other)))
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83 return NotImplemented
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84
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85 def __radd__(self, other):
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86 if hasattr(other, '__html__') or isinstance(other, string_types):
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87 return self.escape(other).__add__(self)
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88 return NotImplemented
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89
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90 def __mul__(self, num):
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91 if isinstance(num, int_types):
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92 return self.__class__(text_type.__mul__(self, num))
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93 return NotImplemented
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94 __rmul__ = __mul__
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95
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96 def __mod__(self, arg):
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97 if isinstance(arg, tuple):
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98 arg = tuple(_MarkupEscapeHelper(x, self.escape) for x in arg)
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99 else:
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100 arg = _MarkupEscapeHelper(arg, self.escape)
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101 return self.__class__(text_type.__mod__(self, arg))
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102
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103 def __repr__(self):
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104 return '%s(%s)' % (
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105 self.__class__.__name__,
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106 text_type.__repr__(self)
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107 )
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108
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109 def join(self, seq):
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110 return self.__class__(text_type.join(self, map(self.escape, seq)))
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111 join.__doc__ = text_type.join.__doc__
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112
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113 def split(self, *args, **kwargs):
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114 return list(map(self.__class__, text_type.split(self, *args, **kwargs)))
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115 split.__doc__ = text_type.split.__doc__
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116
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117 def rsplit(self, *args, **kwargs):
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118 return list(map(self.__class__, text_type.rsplit(self, *args, **kwargs)))
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119 rsplit.__doc__ = text_type.rsplit.__doc__
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120
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121 def splitlines(self, *args, **kwargs):
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122 return list(map(self.__class__, text_type.splitlines(
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123 self, *args, **kwargs)))
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124 splitlines.__doc__ = text_type.splitlines.__doc__
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125
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126 def unescape(self):
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127 r"""Unescape markup again into an text_type string. This also resolves
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128 known HTML4 and XHTML entities:
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129
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130 >>> Markup("Main &raquo; <em>About</em>").unescape()
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131 u'Main \xbb <em>About</em>'
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132 """
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133 from markupsafe._constants import HTML_ENTITIES
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134 def handle_match(m):
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135 name = m.group(1)
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136 if name in HTML_ENTITIES:
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137 return unichr(HTML_ENTITIES[name])
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138 try:
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139 if name[:2] in ('#x', '#X'):
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140 return unichr(int(name[2:], 16))
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141 elif name.startswith('#'):
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142 return unichr(int(name[1:]))
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143 except ValueError:
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144 pass
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145 return u''
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146 return _entity_re.sub(handle_match, text_type(self))
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147
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148 def striptags(self):
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149 r"""Unescape markup into an text_type string and strip all tags. This
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150 also resolves known HTML4 and XHTML entities. Whitespace is
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151 normalized to one:
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152
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153 >>> Markup("Main &raquo; <em>About</em>").striptags()
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154 u'Main \xbb About'
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155 """
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156 stripped = u' '.join(_striptags_re.sub('', self).split())
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157 return Markup(stripped).unescape()
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158
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159 @classmethod
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160 def escape(cls, s):
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161 """Escape the string. Works like :func:`escape` with the difference
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162 that for subclasses of :class:`Markup` this function would return the
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163 correct subclass.
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164 """
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165 rv = escape(s)
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166 if rv.__class__ is not cls:
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167 return cls(rv)
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168 return rv
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169
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170 def make_simple_escaping_wrapper(name):
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171 orig = getattr(text_type, name)
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172 def func(self, *args, **kwargs):
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173 args = _escape_argspec(list(args), enumerate(args), self.escape)
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174 _escape_argspec(kwargs, iteritems(kwargs), self.escape)
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175 return self.__class__(orig(self, *args, **kwargs))
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176 func.__name__ = orig.__name__
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177 func.__doc__ = orig.__doc__
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178 return func
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179
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180 for method in '__getitem__', 'capitalize', \
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181 'title', 'lower', 'upper', 'replace', 'ljust', \
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182 'rjust', 'lstrip', 'rstrip', 'center', 'strip', \
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183 'translate', 'expandtabs', 'swapcase', 'zfill':
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184 locals()[method] = make_simple_escaping_wrapper(method)
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185
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186 # new in python 2.5
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187 if hasattr(text_type, 'partition'):
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188 def partition(self, sep):
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189 return tuple(map(self.__class__,
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190 text_type.partition(self, self.escape(sep))))
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191 def rpartition(self, sep):
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192 return tuple(map(self.__class__,
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193 text_type.rpartition(self, self.escape(sep))))
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194
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195 # new in python 2.6
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196 if hasattr(text_type, 'format'):
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197 def format(*args, **kwargs):
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198 self, args = args[0], args[1:]
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199 formatter = EscapeFormatter(self.escape)
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200 kwargs = _MagicFormatMapping(args, kwargs)
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201 return self.__class__(formatter.vformat(self, args, kwargs))
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202
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203 def __html_format__(self, format_spec):
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204 if format_spec:
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205 raise ValueError('Unsupported format specification '
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206 'for Markup.')
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207 return self
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208
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209 # not in python 3
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210 if hasattr(text_type, '__getslice__'):
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211 __getslice__ = make_simple_escaping_wrapper('__getslice__')
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212
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213 del method, make_simple_escaping_wrapper
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214
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215
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216 class _MagicFormatMapping(Mapping):
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217 """This class implements a dummy wrapper to fix a bug in the Python
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218 standard library for string formatting.
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219
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220 See http://bugs.python.org/issue13598 for information about why
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221 this is necessary.
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222 """
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223
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224 def __init__(self, args, kwargs):
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225 self._args = args
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226 self._kwargs = kwargs
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227 self._last_index = 0
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228
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229 def __getitem__(self, key):
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230 if key == '':
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231 idx = self._last_index
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232 self._last_index += 1
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233 try:
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234 return self._args[idx]
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235 except LookupError:
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236 pass
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237 key = str(idx)
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238 return self._kwargs[key]
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239
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240 def __iter__(self):
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241 return iter(self._kwargs)
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242
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243 def __len__(self):
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244 return len(self._kwargs)
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245
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246
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247 if hasattr(text_type, 'format'):
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248 class EscapeFormatter(string.Formatter):
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249
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250 def __init__(self, escape):
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251 self.escape = escape
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252
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253 def format_field(self, value, format_spec):
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254 if hasattr(value, '__html_format__'):
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255 rv = value.__html_format__(format_spec)
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256 elif hasattr(value, '__html__'):
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257 if format_spec:
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258 raise ValueError('No format specification allowed '
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259 'when formatting an object with '
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260 'its __html__ method.')
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261 rv = value.__html__()
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262 else:
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263 rv = string.Formatter.format_field(self, value, format_spec)
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264 return text_type(self.escape(rv))
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265
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266
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267 def _escape_argspec(obj, iterable, escape):
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268 """Helper for various string-wrapped functions."""
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269 for key, value in iterable:
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270 if hasattr(value, '__html__') or isinstance(value, string_types):
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271 obj[key] = escape(value)
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272 return obj
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273
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274
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275 class _MarkupEscapeHelper(object):
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276 """Helper for Markup.__mod__"""
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277
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278 def __init__(self, obj, escape):
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279 self.obj = obj
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280 self.escape = escape
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281
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282 __getitem__ = lambda s, x: _MarkupEscapeHelper(s.obj[x], s.escape)
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283 __unicode__ = __str__ = lambda s: text_type(s.escape(s.obj))
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284 __repr__ = lambda s: str(s.escape(repr(s.obj)))
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285 __int__ = lambda s: int(s.obj)
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286 __float__ = lambda s: float(s.obj)
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287
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288
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289 # we have to import it down here as the speedups and native
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290 # modules imports the markup type which is define above.
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291 try:
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292 from markupsafe._speedups import escape, escape_silent, soft_unicode
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293 except ImportError:
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294 from markupsafe._native import escape, escape_silent, soft_unicode
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295
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296 if not PY2:
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297 soft_str = soft_unicode
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298 __all__.append('soft_str')